Hi in Japanese

Answer 1

konnichiwa! [hello]weiss / oss [Wassup!]Hai in Japanese means "Yes"

Answer 2

As there's no literal translation of course, you'd just use the same informal greetings Japanese people use.

"Ossu" (say: Ohss) is used fairly often, as is "Hisashiburi" (though that means "hey, it's been a while" kind of thing). Also, you'll often use "Hey how are you?" as an informal greeting, so "Oo, _____-san, genki ka?" (Hey, ____, how are ya?).

It's pretty contextual and there are a lot of possibilities. Those are just a couple of them, so if you're looking for a specific situation or level of formality, let us know.

Answer 3

Commonly, you may say 'konnichiwa' and not offend anyone. Colloquially, (and only to be used among close, close friends) you may say 'oi' or 'ossu.'

Answer 4

Ogenki desuka?more polite would be = ikagadesuka

there is no ? in Japanese as the KA on the end is the same as ?

Answer 5

Genki desu ka.